Employment should be of the cooperation between employer and employee. Salary size must be mutual acceptable or feasible , as we know, living cost varies from palce to place in China.That is why 4000RMB/month may be more than enough for your good life in some rural areas of China ,while 7000RMB/month makes you a poor boy in Shanghai.No body should unconditionally say 15000RMB/month is too high and 4000RMB/month is too low. When you are negotiating a contract, " insult" should be the final word appears in your mind, even the salary quotation is far from your expectation. Otherwise, you screw up yourself.